You'll deffo need something like a paintbrush, as the offside one especially is very hard to get to unless you have tiny hands. I drive over a few times a year t'gaff down South. Currently you need:
V5 Owners doc
Green card for insurance
Spare bulb kit
Luminous Jacket (now a requirement in the cabin area for all cars travelling in France and I believe Belgium too)
Warning Triangle
Failure to abide by the above can lead to an on-the-spot €90-€130 fine
DON'T have a speed camera detector in the car, they'll spank you for it. Loads of speed traps all the way to Paris, from there you're fairly safe. Also, check you have European Breakdown Cover (you never know!)
I personally find Northern France a pretty boring drive, there's nowt to see. The Paris ring road is a hoot though! Shame you're not going further South, there's some great roads.
